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Summary Of Significant Accounting Policies (Schedule Of Amounts Reclassified Out Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2021
Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Accumulated other comprehensive loss at beginning of period $ (11,882)   $ (12,070) $ (10,169)   $ (10,308) $ (12,070) $ (10,308)
Total other comprehensive income, before tax 122     91     367 273
Total tax expense (28) $ (28) (29) (21) $ (22) (21) (85) (64)
Other comprehensive income, net of tax 94 94 $ 94 70 69 $ 70 282 209
Accumulated other comprehensive loss at end of period (11,788) $ (11,882)   (10,099) $ (10,169)   (11,788) (10,099)
Defined Benefit Pension Plan [Member]                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Amortization of unrecognized net (gain) loss 172     143     518 429
Postretirement Benefit Plan [Member]                
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                
Amortization of unrecognized net (gain) loss (5)     (7)     (15) (20)
Amortization of prior service credit $ (45)     $ (45)     $ (136) $ (136)